Color problem with Zenith

[hakaplan]

I have a Zenith color tv from 1996, model SR2768S, serial: 621-42031090.

The blue is gone. I replaced the blue output transistor. No improvement. Don't know where to go now. There is an blue adjustment pot on the board near the transistor--should I mess with that? Would a pic of the board be helpful? It looks to be in good condition--all solder joints nice and no broken traces. Any ideas? Thanks very much.